The US secretary of state says Islamabad would face â€œvery severe consequences,â€ if a terrorist attack on US soil was traced to Pakistan.

â€œWeâ€™ve made it very clear that if — heaven-forbid — an attack like this that we can trace back to Pakistan were to have been successful, there would be very severe consequences,â€ Hillary Clinton told CBS TV during an interview on Saturday.

However, she acknowledged that Pakistanâ€™s attitude toward fighting terrorists had changed remarkably, but emphasized that US President Barack Obamaâ€™s administration â€œexpects more.â€

The remarks followed the arrest of Faisal Shahzad, the suspect behind a failed bombing in New Yorkâ€™s Time Square.

US investigators believe the bomb plot was formulated by more than just one person and US media suggested that Tehrik-e-Taliban Pakistan (TTP) was linked with the attempt.

However, TTP, a pro-Taliban militant group, has denied any connection with Shahzad.

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The Obama Administration officials have said that â€œtheir top priority was to nail down Shahzadâ€™s links to militant groups, and then to press Pakistan to act against the groups.â€